<?php    
class CreatMiniature    

{    

    //公共变量    

    var $srcFile="";        //原图    

    var $echoType;            //输出图片类型，link--不保存为文件；file--保存为文件    

    var $im="";                //临时变量    

    var $srcW="";            //原图宽    

    var $srcH="";            //原图高    

   

    //设置变量及初始化    

    function SetVar($srcFile,$echoType)    

    {    

        if (!file_exists($srcFile)){    

            echo '源图片文件不存在!';    

            exit();    

        }    

        $this->srcFile=$srcFile;    

        $this->echoType=$echoType;    

   

        $info = "";    

        $data = GetImageSize($this->srcFile,$info);    
        switch ($data[2])     

        {    

         case 1:    

           if(!function_exists("imagecreatefromgif")){    

            echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！<a href='javascript:go(-1);'>返回</a>";    

            exit();    

           }    

           $this->im = ImageCreateFromGIF($this->srcFile);    

           break;    

        case 2:    

          if(!function_exists("imagecreatefromjpeg")){    

           echo "你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！<a href='javascript:go(-1);'>返回</a>";    

           exit();    

          }    

          $this->im = ImageCreateFromJpeg($this->srcFile);        

          break;    

        case 3:    

          $this->im = ImageCreateFromPNG($this->srcFile);        

          break;    

      }    

      $this->srcW=ImageSX($this->im);    

      $this->srcH=ImageSY($this->im);     

    }    

        

    //生成扭曲型缩图    

    function Distortion($toFile,$toW,$toH)    

    {    

        $cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH);    

        return $this->EchoImage($cImg,$toFile);    

        ImageDestroy($cImg);    

    }    

        

    //生成按比例缩放的缩图    

    function Prorate($toFile,$toW,$toH)    

    {    

        $toWH=$toW/$toH;    

        $srcWH=$this->srcW/$this->srcH;    

        if($toWH<=$srcWH)    

        {    

            $ftoW=$toW;    

            $ftoH=$ftoW*($this->srcH/$this->srcW);    

        }    

        else   

        {    

              $ftoH=$toH;    

              $ftoW=$ftoH*($this->srcW/$this->srcH);    

        }    

        if($this->srcW>$toW||$this->srcH>$toH)    

        {    

            $cImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);    

            return $this->EchoImage($cImg,$toFile);    

            ImageDestroy($cImg);    

        }    

        else   

        {    

            $cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH);    

            return $this->EchoImage($cImg,$toFile);    

            ImageDestroy($cImg);    

        }    

    }    

        

    //生成最小裁剪后的缩图    

    function Cut($toFile,$toW,$toH)    

    {    

          $toWH=$toW/$toH;    

          $srcWH=$this->srcW/$this->srcH;    

          if($toWH<=$srcWH)    

          {    

               $ctoH=$toH;    

               $ctoW=$ctoH*($this->srcW/$this->srcH);    

          }    

          else   

          {    

              $ctoW=$toW;    

              $ctoH=$ctoW*($this->srcH/$this->srcW);    

          }     

        $allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH);    

        $cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH);    

        return $this->EchoImage($cImg,$toFile);    

        ImageDestroy($cImg);    

        ImageDestroy($allImg);    

    }    

   

    //生成背景填充的缩图    

    function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255)    

    {    

        $toWH=$toW/$toH;    

        $srcWH=$this->srcW/$this->srcH;    

        if($toWH<=$srcWH)    

        {    

            $ftoW=$toW;    

            $ftoH=$ftoW*($this->srcH/$this->srcW);    

        }    

        else   

        {    

              $ftoH=$toH;    

              $ftoW=$ftoH*($this->srcW/$this->srcH);    

        }    

        if(function_exists("imagecreatetruecolor"))    

        {    

            @$cImg=ImageCreateTrueColor($toW,$toH);    

            if(!$cImg)    

            {    

                $cImg=ImageCreate($toW,$toH);    

            }    

        }    

        else   

        {    

            $cImg=ImageCreate($toW,$toH);    

        }    

        $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3);        //填充的背景颜色    

        ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor);    

        if($this->srcW>$toW||$this->srcH>$toH)    

        {         

            $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);    

             if($ftoW<$toW)    

             {    

                 ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH);    

             }    

             else if($ftoH<$toH)    

             {    

                 ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH);    

             }    

             else   

             {    

                 ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH);    

             }    

        }    

        else   

        {    

             ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);    

        }    

        return $this->EchoImage($cImg,$toFile);    

        ImageDestroy($cImg);    

    }    

        

   

    function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH)    

    {    

        if(function_exists("imagecreatetruecolor"))    

        {    

            @$creatImg = ImageCreateTrueColor($creatW,$creatH);    

            if($creatImg)     

                ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);    

            else   

            {    

                $creatImg=ImageCreate($creatW,$creatH);    

                ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);    

            }    

         }    

         else   

         {    

            $creatImg=ImageCreate($creatW,$creatH);    

            ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);    

         }    

         return $creatImg;    

    }    

        

    //输出图片，link---只输出，不保存文件。file--保存为文件    

    function EchoImage($img,$to_File)    

    {    

        switch($this->echoType)    

        {    

            case "link":    

                if(function_exists('imagejpeg')) return ImageJpeg($img);    

                else return ImagePNG($img);    

                break;    

            case "file":    

                if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File);    

                else return ImagePNG($img,$to_File);    

                break;    

        }    

    }    

}    

?>

